chore(pagination): preventDefault on click

- Add `event.preventDefault` call in order to avoid potential router bugs

Closes #4096

Author: wesleycho

src/pagination/pagination.js

@@ -46,6 +46,10 @@ angular.module('ui.bootstrap.pagination', [])
   };
 
   $scope.selectPage = function(page, evt) {
+    if (evt) {
+      evt.preventDefault();
+    }
+
     var clickAllowed = !$scope.ngDisabled || !evt;
     if (clickAllowed && $scope.page !== page && page > 0 && page <= $scope.totalPages) {
       if (evt && evt.target) {